If the issue is with the DE, I’m actually using the Xfce edition of Linux Mint. I would just use VLC but it gives me performance issues because I don’t have the best hardware and mpv seems to work much more efficiently. But yeah, changing the audio output fixed this issue, I’m guessing the flatpak version of mpv defaults to pipewire. I was curious and I did test pipewire with both versions and I got the same results that they did.
I’m gonna be honest, I don’t like the amount of power big corporations have. Nintendo is currently abusing their power to stifle their competition and potentially harm the future of gaming. Google recently proved that they have pretty much full control over the internet. Microsoft is ruining the entire PC market. I could name more but these are the first few that came to mind.